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Paper Covered Enameled Wire

Mainly used for windings of oil-immersed transformers, reactors and other electrical devices.

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  • Global delivery as fast as 15 days
  • Has factory stock, free sample
  • Coated copper winding wire and aluminum wire
  • Plastic and wooden spool
  • About 30kg-150kg per roll with low electrical resistance
  • ISO 9001:2020, UL certificate
  • Acid and alkali corrosion resistance

  • Paper Covered Enameled Wire Features - Specifications

    1. Type: Paper covered copper wire, enamele aluminum wire; Flat/rectangular wire, round wire
    2. Insulation material type: kraft paper, thermally upgraded kraft paper or nomex paper
    3. Insulation thickness: single, double, triple, multi-layers or according to your requirements; polyester/polyimide film
    4. Has excellent withstand voltage performance in oil, and is widely used in the manufacture of transformer coils.
    5.Paper Covered Enameled Winding wire wrapped with specific insulating material.

  • Paper Covered Enameled Wire Manufacturing Process

    Paper Covered Enameled Wire (PCEW) is a specialized type of wire that combines the benefits of enameled wire with an additional layer of paper insulation. This combination provides excellent electrical insulation and thermal performance, making PCEW ideal for use in high-voltage and high-temperature applications such as transformers, reactors, and motors.

    Paper Covered Enameled Wire can be divided into telephone paper covered wire and Nomex paper wrapped wire. Application of paper-covered wire limited: Paper-covered wire is a kind of magnet wire, which is used to manufacture winding coils of various oil-immersed transformers. It has good insulation on the outside and good insulation on the inside. Conductivity, it is the core of the transformer. The advantages of the paper-covered wire are due to its high electrical, chemical and mechanical integrity, and its elasticity, flexibility, tear resistance, moisture resistance and abrasion resistance are very good, and it is very resistant to acid and alkali corrosion, and will not be affected by insects.

    Paper Covered Enameled Wire uses telephone paper, cable wire or 500KV transformer inter-turn insulating paper for insulation. After impregnation, the temperature index is 105, 130, 155, 200, 220.

  • Paper Covered Enameled Wire Application

    Transformers: For windings that require high insulation resistance and thermal stability.
    Reactors and Chokes: In applications needing robust insulation to handle high voltages.
    Motors and Generators: For windings where enhanced insulation is crucial for reliable operation.
    High-Frequency Equipment: Where the combination of enamel and paper insulation provides superior performance.

  • Advantages

    Enhanced Insulation: Combines the high dielectric strength of enamel with the additional insulation of paper.
    Thermal Stability: Suitable for high-temperature applications.
    Mechanical Strength: The paper layer adds mechanical strength and protection to the wire.
    Reduced Losses: Minimizes electrical losses due to the high-quality insulation.

Hot Sale Paper Covered Enameled Wire

Paper Covered Enameled Wire includes paper covered copper wire and paper covered aluminum wire.

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Special high thermal class paper covered wire – NOMEX wrapped wire

NOMEX wrapped paper enameled wire is a enameled wire extruded from an oxygen-free copper rod or an electrical round aluminum rod through a mold of a certain specification, and then wrapped by a T410 type NOMEX insulating paper. It is mainly used for transformers, electric welding machines, electromagnets Or other similar electrical equipment product windings.
Due to its high electrical, chemical and mechanical integrity, elasticity, flexibility, tear resistance, moisture and moisture resistance, NOMEX paper is very corrosive and will not be destroyed by insects, molds and fungi, it can be combined with All types of varnishes, adhesives, transformer fluids, lubricants, and refrigerants are compatible. In addition, NOMEX paper has a high heat resistance temperature. Even if the temperature is as high as 220 °C, it still maintains the original insulation performance. Transformers using NOMEX paper-covered wires can be used for Customers bring many economic, environmental and safety benefits.

Paper Covered Enameled Wire Manufacturing Process

Materials and Preparation

  1. Conductor Material:
    • High-quality copper or aluminum wire is used as the conductor material. Copper is more commonly used due to its superior electrical conductivity.
  2. Insulating Materials:
    • Enameled wire: The wire is initially coated with an enamel insulating layer.
    • Paper: Specially designed insulating paper is used to cover the enameled wire.

Manufacturing Process

1. Enameling

  1. Wire Drawing:
    • The copper or aluminum wire is drawn to the required diameter using wire drawing machines.
  2. Cleaning:
    • The wire is cleaned to remove any oxides, grease, or other contaminants that could affect the adhesion of the enamel.
  3. Annealing:
    • The wire is annealed (heated and cooled) to relieve internal stresses and improve its flexibility and ductility.
  4. Enamel Coating:
    • The clean and annealed wire is passed through an enamel application process where it is coated with a thin layer of insulating enamel.
    • The coated wire is then passed through a curing oven where the enamel is baked onto the wire, forming a hard and durable insulating layer.
    • Multiple layers of enamel may be applied, with each layer being cured before the next is applied, to achieve the desired insulation thickness.

2. Paper Covering

  1. Paper Application:
    • The enameled wire is then fed into a paper covering machine.
    • Strips of insulating paper are precisely wrapped around the enameled wire. The paper can be applied in a single layer or multiple layers depending on the required insulation thickness.
  2. Taping and Binding:
    • The paper is applied in a helical or longitudinal fashion, ensuring complete coverage of the enameled wire.
    • The ends of the paper wrapping are typically secured using a small amount of adhesive or by tightly binding the paper to ensure it does not unravel.

3. Final Processing

  1. Drying and Curing:
    • The paper-covered enameled wire may undergo a drying process to remove any moisture that could be present in the paper. This is crucial to maintain the insulating properties of the paper.
    • The drying process usually involves passing the wire through an oven at a controlled temperature.
  2. Testing and Quality Control:
    • The finished wire is subjected to a series of tests to ensure it meets all electrical, mechanical, and thermal specifications.
    • Tests include measuring the insulation resistance, dielectric strength, and verifying the uniformity and integrity of the paper covering.
  3. Spooling and Packaging:
    • The completed wire is carefully wound onto spools or reels, taking care to avoid any damage to the insulation.
    • The spooled wire is then packaged appropriately to prevent damage during transportation and storage.

Quality Assurance

  1. Visual Inspection:
    • Inspecting for any visible defects in the enamel and paper layers, such as cracks, bubbles, or gaps in coverage.
  2. Electrical Testing:
    • Conducting tests to ensure the wire meets specified electrical properties, such as insulation resistance and dielectric breakdown voltage.
  3. Mechanical Testing:
    • Verifying the mechanical properties of the wire, such as tensile strength and flexibility.
  4. Dimensional Checks:
    • Ensuring the wire diameter and insulation thickness meet the specified tolerances.